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Runestone
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==Preservation and care== The exposed runestones face several threats to the inscribed rock surface. In Sweden, [[lichen]] grows at approximately {{cvt|2|mm|in|frac=16}} per year. In more ideal conditions it can grow considerably faster. Many runestones are placed alongside roads and road dust causes lichen to grow faster, making lichen a major problem. The lichen's small root strands break through the rock, and blast off tiny pieces, making the rock porous, and over time degrade the inscriptions. [[Algae]] and [[moss]] also cause the rock to become porous and crumble.<ref name=svenskarunor>Snaedal & Γ hlen 2004:33-34</ref> Water entering the cracks and crevices of the stone can cause whole sections to fall off either by freezing or by a combination of dirt, organic matter, and moisture, which can cause a hollowing effect under the stone surface.<ref name=svenskarunor/> Proper preservation techniques slow down the rate of degradation. One method to combat the lichen, algae and moss problem is to smear in fine-grained moist clay over the entire stone. This is then left to sit for a few weeks, which suffocates the organic matter and kills it.<ref name=svenskarunor/>
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